Social networking is the inthing . Everyone has an account or two. If you are not on networking sites it is considered tad ugly and uncool.
Networking sites are cropping up everyday, while facebook continues top all of them.
Myspace another good site, but it is loosing its sheen and users
Twitter is growing rapidly and spreading like fire. Bebo friendster and hi5 are also popular.
For a networking site to be successful it is important that it offers good privacy, has a huge user base, is simple to use and has good interface. Twitter is rapidly gaining new and unique users with addition of celebs while others like myspce and hi 5 are loosing traffic and users.
Top networking sites of 2010 are

3. twitter
2. Myspace
1. facebook